noun
snarling old man; irascible old man
A colloquial, slightly humorous term for a grumpy, quick-tempered older man who often scolds or shouts. The image is of a thunder god-like figure.
隣の雷親父がまた怒鳴っている。
The grumpy old man next door is yelling again.
あの先生は雷親父みたいで怖い。
That teacher is like a snarling old man and scary.